5/19/2011 @ 3:15PM

Gallery: The World's Biggest Givers

In 1992 Jon Huntsman Sr. was diagnosed with prostate cancer; on the way to the hospital for treatment, he made three stops: First the chemicals mogul dropped by a homeless shelter and left a $1 million check. Then he stopped at a soup kitchen and handed over another $1 million check. Finally he dropped off $500,000 at the clinic that had found his malignancy. Since then Huntsman, who says he plans to give it all away before he dies, has donated the majority of his fortune to his cancer foundation.